Complexes of hydroxamates VI: Binary and ternary complexes involved in the palladium(II) monohydroxamic acids—glycylglycine systems

Divalent Transition Metal Ion Mixed-Ligand Complexes of Tricine or Glycylglycine and 8-Hydroxyquinoline: Synthesis, Characterization, and Formation Constants

“…[12] The¯exibility is largely dependent on the pH values at which the complex formation is achieved. [477,12,15,16] Considerable attention has been paid to the investigation of the metal complex-forming properties involving such ligands using various techniques. [4730] However, particularly with divalent metal ions, [4714] the results are by no means as certain; con¯icting interpretations for the mode of coordination and discrepancies of stability constant values have been reported.…”

[Pd(en)(H2O)2]2+ and [Pd(pic)(H2O)2]2+ complexation by monohydroxamic acids: A solution equilibrium and solid state approach

“…In one of the few studies, stability constants were published for the bis and ternary complexes formed in the Pd(II)-methioninehydroxamic acid and Pd(II)-methioninehydroxamic acid-glycylglycine systems, respectively. In the same work, precipitation hindered the solution equilibrium study with several other aminohydroxamic acids [22]. The first examples for the existence of di-and trinuclear Pd(II) complexes between [Pd(en)] 2+ and a dihydroxamic acid (2,5-pyridinedihydroxamic acid) in solution were described in one of our previous papers [17].…”

“…Although equilibrium studies might be possible with Pd(II)-containing systems (unlike Pt(II)), only a very limited number of papers deal with Pd(II)-hydroxamate complexes in solution [17,22]. In one of the few studies, stability constants were published for the bis and ternary complexes formed in the Pd(II)-methioninehydroxamic acid and Pd(II)-methioninehydroxamic acid-glycylglycine systems, respectively.…”

Effects of Tris and Hepes buffers on the interaction of palladium–diaminopropane complexes with DNA

“…Recent advances in this area have focused on Pd(II) complexes with one N,N-diamino [17][18][19][20] or N,S-aminothioether [21][22][23] chelating ligand that impels cis-coordination with more labile ligands (containing two chlorine or nitrate moieties or one dicarboxylate moiety). In such cases, the chelating ligand prevents cis-trans isomerization around Pd(II) in spite of its greater lability (about 10 5 -fold) relative to its Pt(II) [13,17,24] analogs.…”